JavaFX how to get menubar to fit to parent in width only?

Question

I am using Scene Builder to create my GUI and my menu bar isn't resizing to the parent. How do i get it to do this?

When I try Modify -> Fit to Parent, the menu bar takes up the whole root pane, and obviously this isn't what i want. Here is an image of what i am talking about:

As you can see, the menu bar doesn't fully extend to the end of the window.

Answer 1

I had to set the anchor pane constraints in the menu bar. I had to make the left and right margins zero:

Answer 2

You need to bind the preferred width property of your menu bar to the width of your stage or some other container node. It works when you dynamically resize too.

menuBar.prefWidthProperty().bind(primaryStage.widthProperty());

Answer 3

Here is another way to do it. Wrap MenuBar in a HBOX. Set MenuBar's HGrow to ALWAYS. Set HBOX Node Alignment to TOPLEFT.